130 A REVIEW OF 



BRITISH CHAR ACE JE. 



C. curta, Kiitz. Tab. Phyc. vii., t. 53. C. aspent, var. curta, 

 A. Braun, is a small form with very short branchlets and many 

 spine-cells, which may probably be found in Britain. C. aspera 

 appears to be confined to the northern hemisphere ; it is widely 

 distributed in Europe, but more common in the north, also 

 occurring in Asia, North Africa, and North America ; it is rare in 

 England, but more common in Ireland. 



Lakes, ponds, canals, and brackish pools. July and August.— 

 Cornwall, W. ; Hants, " Hut Pond" (var. c) ; Surrey; Carnarvon; 

 Anglesea (and var. b) ; Nottingham; York, S.W. ; Northumber- 

 land, S. ; Fife (and var. c) ; Shetland ; Kerry, N. ; Wicklow ; 

 Westmeath ; Galway , * ■ La verly Common ' ' ; Mayo, ' ' Lough 

 Mask" and "Foxford"; Cavan; Antrim. 



Var. capMata.— Near Holyhead, Anglesea, W. Wilson, July, 

 1828. 



Var. lacmtris.— Lough Cullen, West Mayo, Hb. More. 

 § 2. Diplostich*:. — Stem with 2 rows of cortical cells tr> each branchlet. 



v. C. tomentosa, Linn. Spec. Plant. (1753), p. 1156; Bruzel. 

 Obs. Char., pp. 13 and 20; Fl. Dan. (1829), t. 1941; Bab. 

 A. N. H., v. (1850), p. 90; Wallm. Act. Acad. Stockh., 1854, 

 p. 317; Kntz. Tab. Phyc, vii., t. 74, f. 1 ; Nordst. & Wahlst. Exs. 

 30, 81, 50-4, 88, 89. 



C. latifolia, Willd.' Gesells. Nat. Freunde BerL, iii. (1809), 

 p. 298 ; Hook. Lond. J. of Bot., 1842, p. 43 ; Hook. Icones Plant., 

 vol. vi. (1843), t. 532. 



C. ceratophtfUa, Wallr. Ann. Bot. (1815), p. 192, tab. v. ; Fl. 

 Dan (1819), 1654 ; Bruz. Obs. Char., p. 20 ; Gant. Oesterr. Char., 

 p. 16 f. 10; Wallm. Act. Acad. Stockh., 1854, p. 318; Kiitz. 

 lab. Phyc, vn., t. 73; Brann, Consp. Char. Europ.,p. 5; Braim, 

 E. & S. Exs. 8, 9, 35, 36. 



Stem rather stout, much branched. Primary cortical cells 

 very prominent, with scattered, short, stout, acute, usually 

 solitary spine-cells. Whorls of 5-7 slightly incurved branchlets. 

 btapolodes usually small, ovate-acuminate. Branchlets stout, of 

 4-o long joints, of which 1-3 are ecorticate. Bract-cells usually 

 6, wfiorled, very broad, longer than the nucule. Nucules ovoid 

 i^-14 striate coronula prominent, spreading. Globules very large. 

 Diopcinus. (Tab. 207, f. 5.) 



A large plant, sometimes much incrusted, distinguished by its 



stout bract-cells, which are very conspicuous. As Limueus in 



Species Plantarum' distinguishes C. tZmertm from O, hupiM by 



ti e character " actdeis eatdinu oratis," it i.s evident that be had our 



rtlrl U \ V*™'*??* , tlie specimen in his herbarium is a good 

 lepicsentativeofit; the Linnean name has therefore been retained 

 in preference to ( '. ceratophyll*, Wallr.. that adopted by Braun. 

 IMril (1 T lsc ; ,v,r ^ «* belaud by Dr. D. Moore in 1841, at 

 ™ I t , r'' Westmeath, !m ,l .afterwards found bv him in a 

 scconn locality, m the River Shannon below Portumna. f. 



R 53! TV" W£ Dt l y confined to Europe, being commoner in the 

 Baltic districts. The Iri.l, plant is a small form with sometimes only 



